One of the mysteries of the English language finally explained.
Any of numerous liverworts of the family Ricciaceae, which comprises thallose liverworts found worldwide in moist soils and aquatic habitats; (in later use) specifically Riccia fluitans, commonly used as an aquarium plant.
Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist. From crystal + wort, perhaps so called on account of its branching thallose structure.
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